Vacuum breaker



Aug. 22, 1933. B, WOLQERT N 1,923,349

VACUUM BREAKER Filed July 9, 1932 Patented Au 22,1933 v y I he 1,923,349

uulTEb zsr'arss "PATENT: OFFICE VACUUM BREAKER,

Percy B.Wolverton, Chicago, Ill., assignor to Julia N. Larson, Chicago,Ill. i

Application July 9, 1932. Serial No. 62l,547 1:01am. (C1. 296-1) Thisinvention relates to an automobile brother ,air is drawnlinto the backof the body when in -vehicle and more particularly to a device forpremotion to break the vacuum there. I pventing a vacuum behind the carwhile it is in l The means for accomplishing the above object motion; sa s A is made apparent in the following description, 5 All bodiesimmersed in a viscous fluid as aliq-. which is to be read n junctionwiththe 'ac- 6 uid or a gas have their movement impeded by thateompanying single sheet of drawing hereby made confluent substance. Theforward movement of a p Of this Specification. s .abody in air. ishindered by a frictional drag set I h drawing, Figule 1 is a elevflhilhOf an up by the air along the sid s and by th 1 d automobile in whichthe invention in one form l pressure in the wake of the body due todisplaceisfimployed, the real Darts the b y of Such ment of the air bythe movement of the vehicle. automobile being broken y to w de a ls ofWhen a body, such as an automobile, having a Structure; g wallsubstantially flat at its rear and normal to Figure 2 is a rear v w f thaut m bile shown the path of the travel of the body is forced in Figurethrough t atmosphere a resisting dynamic air Figure 3 is a sectionaldetail illustrative of a 70 pressure is set up at the forward andforwardly Second form of the invention inclined surfaces of the bodypresented to the air Like reference characters indicate Similar Part5stream, and concurrently a decrease in pressure is in the followingdeschiptioh and in the drawing produced at the rear of t rear flat sideAttention is first directed to the rear of the Y It is known that suchdynamic pressure can be body 10 of the automobile- The top 11 projects75 easily overcome by constructing the moving body backwardly of thebody to form an inverted. to give it a fair form that is, such f thatledge or shoulder 12. The shoulder 12 slopes the dynamic pressure f theimpulse near the upwardly and rearwardly from the rear body 10. front iscounter balanced by that of the reaction A Wan formed of customary bodymaterial f the air as it closes in around the back body is fabricated tothe sides 14 of the car to extend 80 portion. such a body of form is ofstream backwardly of the rear body 10. Intermediate line proportions, asis a fish or a turpedm Such the memberslo and 13 is provided a channel15 a body when moved through the at ordinary termlnatlng in a generallyrectangular opening speeds produces little turbulence in its wakeindicqnilguous to h the beginning eating density resistance littlebeyond that of the 9 Sald channel bemg m a'similar Opening 17 idealStream4me body acent to the bottom edge of the car body.

Although the modern automobile is designedll back wan 13 gerieljany inparallelism constructed of a. cuneiform shape to reduce the wlth the carbody mamtammg the channel 15 formation of eddy currents of air, it isnot pracof a generally constant or fixed cross Sectionticable to providea rear protuberance on the The lower of the wan 13 preferably has a bodyfor the reason that said protuberance would gently siopmg Cmve 18 topresent the extreme make for unwieldy manipulation and tram: end sectionl9 of the channel below the car body cumes at an angle slightly lessthan the horizontal.

When a car outfitted as described is moved It n b t f h 40 1s a o Jec ot 8 present mventlon to pro forwardly, a part or portion of the airstream vlde a means to overcome the ob ectlonable space passing beneaththe car body is Swept into the of reduced air pressure in the wake of amoving 0 cum 1'? to be directed u w rdl automobile or other vehicle, andwithout the em- 2 15 E out the port or i i 233 3 5 3 ploymeht of ashmcture t depend into such Spaceinjected into the normally evacuatedspace to 45 It is a additlonal Object of e h inventhe rear of the carmaterially increases the air tion to provide a means intricate to theembodi pressure i h space, with th air pressurement of an automobile orother vehicle for deflectbehind the car or vehicle approaching thepresing an air stream into the space of reduced air sure at the front ofthe car, the dynamic pressure pressure at the rear of the moving body.is partially neutralized with the result that adat It is a furtherobject of the present invention to ditional locomotion power of thevehicle, in procreate in the wake of a moving automobile an air portionto the increased rear air pressure, is availpressure approaching thedynamic air pressure able for driving said vehicle forward. Greaterwhich is upon the front of the vehicle. speed may be had for the samepower, or the It is a further object of the invention to proautomobilemay be efficiently operated with less 55 vide a structure in automobilebodies whereby power.

the front of the space occupied by the fuel tank, the air which isconventionally deflected downwardly by such tank is deflected to aposition of utility. Since the sections 18 and 19 do not project into anair stream not already bombarding an area normal thereto, namely, thefuel tank,

, no additional impedance is imparted to the car by the air channelherein described; All of the increased energyobtainable because of theair introduced in the wake of the vehicle, therefore, may be reckoned onthe basis of one hundred percent eifectiveness.

It will be noted that the embodiment of the invention herein describeddoes not in any way detract from the appearance of the car. The wall 13and the back of the top 11 are in mutually alined continuation. Achannel bead 20 may be formed on the body 14 to further conceal orcamouflage the discharge port.

In addition to the air which is forced into the air duct by the pressureof the air forced from the path of the automobile, the vacuum created atthe rear of the car as an incident to motion ofthe v'ehicle' body-causesair to be sucked or drawn through the air duct in anendeavor to, theback of the device equalize the pressure at with that at the front;

For this reason, it is possible to use a modified the vacuum there fromthe 1,923,349 Since the opening 17 is positioned directly to form of theinvention, such as that shown in Figure 3 in which no deflecting lip isemployed upon the air duct. All of the parts of the second form of theinvention correspond with the parts shown in the form first described,the only real diil'erence being in the shape of the wall 1, such wall inFigure 3 being designated as 119. The lower end of said wall does notproject into the path 01' onrushing air beneath the underside of theautobody in a plane substantially equidistant from ,the top and bottomof said body, and walls cowall to form a fiume to wall, said fiumeextendacting with said back the front of said back 'ing "upwardlyfromthe bottom of said body and having an opening in'a position beneaththe bottom and transverse body, the'opening in motion of travel of saidautomobile.

of, the rear part of said PERCY B. WOLVERTON.

said fiume being-in the di-

